10
Fault Diagnosis
Hard to Start or Unable to Be Started
Fault Diagnosis
Adjustment
Fault Cause
Adequate and smooth
gasoline supplied for
the injector
No gasoline
supplied for
the injector
Check whether
the gasoline
pump works
normally
Sparking of
spark plug
Weak sparks of
spark plug, no
sparks of spark plug
Remove the spark plug,
put the spark plug into
spark plug cover, and
check whether there are
sparks of spark plug after
bonding with the engine
Compression
pressure is
normal
Too low or no
compression
pressure
Determination of
compression pressure
No ignition
outbreak of
engine
Ignition outbreak
of engine but
without starting
Wet spark
plug
Dry spark
plug
Remove the spark plug
for inspection again
No gasoline in the gasoline tank
Oil tube blockage of gasoline tank injector
Oil tube blockage of gasoline pump
Tube blockage of fuel tank evaporation
control system
Blockage of gas filter
Insufficient pressure of gasoline pump
Failure of spark plug
Polluted spark plug
Failure of ECU Assembly
Failure of trigger
Ignition coil wire is disconnected or under
short-circuits
Ignition coil is disconnected or under
short-circuit.
Failure of main switch
Failure of charge coil
Failure of startup clutch
Failure of cylinder piston and piston ring
Air leakage of cylinder gasket
Failure of automatic choke apparatus
Air in theinjection manifold
Improper ignition time
Improper adjustment of throttle
adjustment screw
Excessive gasoline injected by injector
Failure of automatic choke apparatus
Large throttle opening
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